docs: def sendOACK(self):
          """This method sends an OACK packet with the options from the current
          context."""
          log.debug("In sendOACK with options %s", self.context.options)
          pkt = TftpPacketOACK()
          pkt.options = self.context.options
          self.context.sock.sendto(pkt.encode().buffer,
                                   (self.context.host,
                                    self.context.tidport))
          self.context.last_pkt = pkt